Revert "Revert "zram: Register with show_mem notification framework"" (83d50d20) · Commits · e / devices / android_kernel_sony_msm8994

drivers/block/zram/zram_drv.c

+41 −0

Original line number	Diff line number	Diff line
		@@ -37,6 +37,7 @@
		#include <linux/string.h>
		#include <linux/vmalloc.h>
		#include <linux/ratelimit.h>
		#include <linux/show_mem_notifier.h>
		#include <linux/err.h>

		#include "zram_drv.h"
		@@ -84,6 +85,45 @@ static inline bool init_done(struct zram *zram)
		return zram->disksize;
		}

		static int zram_show_mem_notifier(struct notifier_block *nb,
		unsigned long action,
		void *data)
		{
		int i;

		if (!zram_devices)
		return 0;

		for (i = 0; i < num_devices; i++) {
		struct zram *zram = &zram_devices[i];
		struct zram_meta *meta = zram->meta;

		if (!down_read_trylock(&zram->init_lock))
		continue;

		if (init_done(zram)) {
		u64 val;
		u64 data_size;

		val = zpool_get_total_size(meta->mem_pool);
		data_size = atomic64_read(&zram->stats.compr_data_size);
		pr_info("Zram[%d] mem_used_total = %llu\n", i, val);
		pr_info("Zram[%d] compr_data_size = %llu\n", i,
		(unsigned long long)data_size);
		pr_info("Zram[%d] orig_data_size = %u\n", i,
		atomic_read(&zram->stats.pages_stored));
		}

		up_read(&zram->init_lock);
		}

		return 0;
		}

		static struct notifier_block zram_show_mem_notifier_block = {
		.notifier_call = zram_show_mem_notifier
		};

		static inline struct zram dev_to_zram(struct device dev)
		{
		return (struct zram *)dev_to_disk(dev)->private_data;
		@@ -1283,6 +1323,7 @@ static int __init zram_init(void)
		goto out_error;
		}

		show_mem_notifier_register(&zram_show_mem_notifier_block);
		pr_info("Created %u device(s)\n", num_devices);
		return 0;